Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f0ab5557460b0…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 11:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84c3f4e917de288335a428fdb9496bbb SHA-1: 799770c63c729ab5471902b48dccf438cbbf8896 SHA-256: 6a3f0ab5557460b001395aaf86c57de4b142205299942dfe041411deb1fb4f37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable domains and are likely used to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jandebruijn.com/uploadimages/files/62672634632.pdf In PDF document text
    • http://aqcorth.specialty-match.com/upload/files/14695956849.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/5060176914.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/sijawuzekapemusixurof.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/56274350722.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/17718972641.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/basinixab.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/66960722926.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/86apgu01b5nh00u9ghv163lhac/moxojiwinevavugilutewa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322d3863161---39855846113.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/guzobosudib.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/32495962796.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tinedo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090819200373499.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/berizivax.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/58824407652.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lewetizatamiminewe.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/25567975648.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22573525968.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/18875941085.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/nonolujiwonasikeweriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=amazon+prime+mod+apk+indiaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 17588 bytes
SHA-256: f5cfbd758a89888ea5bcb0ad57f383dddf1432f623db9f7a65c98c8029a465fc
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10376 bytes
SHA-256: d0d2c42b7e11ea7fad87762c72bfaf2d91abb7cd07643f0c9975f64eb68e0858
font_02_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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